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diff --git a/public/steam/isteamappticket.h b/public/steam/isteamappticket.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: a private, but well versioned, interface to get at critical bits
+// of a steam3 appticket - consumed by the simple drm wrapper to let it 
+// ask about ownership with greater confidence.
+//
+//=============================================================================
+
+#ifndef ISTEAMAPPTICKET_H
+#define ISTEAMAPPTICKET_H
+#pragma once
+
+//-----------------------------------------------------------------------------
+// Purpose: hand out a reasonable "future proof" view of an app ownership ticket
+// the raw (signed) buffer, and indices into that buffer where the appid and 
+// steamid are located.  the sizes of the appid and steamid are implicit in 
+// (each version of) the interface - currently uin32 appid and uint64 steamid
+//-----------------------------------------------------------------------------
+class ISteamAppTicket
+{
+public:
+    virtual uint32 GetAppOwnershipTicketData( uint32 nAppID, void *pvBuffer, uint32 cbBufferLength, uint32 *piAppId, uint32 *piSteamId, uint32 *piSignature, uint32 *pcbSignature ) = 0;
+};
+
+#define STEAMAPPTICKET_INTERFACE_VERSION "STEAMAPPTICKET_INTERFACE_VERSION001"
+
+
+#endif // ISTEAMAPPTICKET_H